VR Lens Barrel Position Sensing Without Limit Switches
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Solution Overview
Problem
Existing VR devices face issues with lens barrel sticking during position adjustment, leading to motor wear and increased detection complexity and cost due to the need for photoelectric or mechanical limit switches at each position.
Innovation Solution
A VR device with a magnet and magnetic sensor arrangement, where one is embedded on the lens barrel housing and the other is fixed at a preset position, allowing real-time detection of the lens barrel's positional state using the magnetic sensor's output electrical signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photoelectric elements or mechanical limit detection switches are installed at every moving position to detect lens barrel sticking, then the detection accuracy is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the detection function from multiple discrete switches at different positions and consolidates it into a single magnetic sensor. By placing a magnet on the lens barrel and a magnetic sensor at a fixed position, the system detects positional state changes through magnetic field variations, eliminating the need for multiple mechanical or photoelectric switches while maintaining detection accuracy.
Solution Approach 2:
The patent replaces mechanical limit detection switches and photoelectric elements with a magnetic field-based detection system. The magnetic sensor detects the positional state of the lens barrel through magnetic field interactions with a magnet attached to the lens barrel, substituting mechanical contact and optical detection with a non-contact magnetic field sensing approach that reduces device complexity.
2Ease of operation
If the motor continuously operates to adjust lens barrel positions, then the position adjustment capability is maintained, but motor wear and heating increase, reducing service life
Solution Approach 1:
The patent implements a feedback mechanism where the magnetic sensor continuously monitors the positional state of the lens barrel during motor operation. The main controller receives real-time feedback about whether the lens barrel is stuck or moving normally, allowing it to adjust motor operation accordingly. This prevents continuous motor operation under stuck conditions, reducing wear and heating while maintaining position adjustment capability.
Solution Approach 2:
The patent uses periodic detection of the lens barrel positional state during motor operation. The magnetic sensor periodically checks the position, and the main controller periodically adjusts motor operation based on these checks. This periodic monitoring and adjustment prevents continuous operation without interruption, reducing motor wear and heating while maintaining the ability to adjust positions when needed.
3Measurement precision
If multiple detection components are installed at each lens barrel position, then the detection coverage is improved, but the manufacturing cost increases
Solution Approach 1:
The patent makes the magnetic sensor multi-functional by using it to detect the positional state of the lens barrel at any position along its movement range, rather than requiring separate detection components at each position. The magnetic field-based detection works universally across the entire movement range, allowing a single sensor to perform the function of multiple switches while reducing manufacturing cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces detection complexity and cost by eliminating the need for switches at each position, ensuring accurate and efficient lens barrel position adjustment.
Implementation Method 1
one of the magnet and the magnetic sensor is embedded on a lens barrel housing of the lens barrel module, and the other one is fixed at a corresponding preset position of the lens barrel module; the main controller controls the lens barrel module to move and detects an output electrical signal of the magnetic sensor during movement of the lens barrel module so as to determine a positional state of the lens barrel module
Data Source
AI summary
The present disclosure provides a virtual reality device, a lens barrel positional state detection method and apparatus therefor, and a medium. The device comprises: a lens barrel module, a magnet, a magnetic sensor, and a main controller, wherein one of the magnet and the magnetic sensor is embedded on a lens barrel housing of the lens barrel module, and the other one is fixed at a corresponding preset position of the lens barrel module; wherein the main controller controls the lens barrel module to move and detects an output electrical signal of the magnetic sensor when the lens barrel module moves so as to determine a positional state of the lens barrel module. The real time detection of the positional state when the lens barrel module in the VR device is achieved through a simple layout arrangement of the magnetic sensor and the magnet so as to reduce the complexity of lens barrel positional state detection within the VR device such that the setting costs of lens barrel positional state detection within the VR device is reduced.